Escapement for type-writer carriages.



P. ALEXANDER. BSCAPEMENT VPOR TYPE WEITER OARRIAGBS.

APPLICATION FILED JUNE 8, 1909.

Patented Mar. 1,w1910.

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Original applicatonillled Mal-chan, 19de, eral 11o. 1909. daria! remaniement. r Patented lidar. ill., 19rd.

Alnlm. Braided and this application tiled .Tune ll, No. Hellmann. l

To all whom 'it may concern: i

Be it known that I,.F1rnnnnIorr'iLnirAn-"i Das, a citizen of the rUnited States, residing at New York city, borough of Brooklyn, Kings county, New York, have invented certain nenT Aand useful Improvements in `Fscapenients for rllypeflflriter Carriages, of which the following is a clear, full, and-exact description. i

`This invention relates to an escapernent for typewriting `noachine carrilages, the ob ject being to provide an escapernent which is adapted for usage in connection 'with a single rack, the said rack being, asis usual, carried by the said carriage. i

With the usual torni of rack, the carriage is very apt to skip or jump a tooth or teeth owing to the fact that the carriage moving 'mechanism operates too quickly for the forfn of escapement used on all the standard machines.

The object of my invention is to produce an escapement so constructed asto prevent the above mentionedlskipping or jumping.

ll vwill now roceedto describe my inven. tion and tina ly claim' the novel features thereof, reference being had to the accompanying drawing forming part hereof, wherein.:

Figure 1 is a crosssectional `view of an arbitrary .form of typewriter frame and movable carriage thereon, showing my im proved escapement in position; Fig. 2 is a fragmentary rear View thereof, certain parts being omitted and the escapernent su port shown in section; Fig. 3 is an enlarge sectional plan View of the eseapement, the section being taken on a line a-n in Fig. 2;. and Figs. 4 and 5 are diagrammatic views of'did'erent positionss of the dogs ot the es capement. i

The escapement which ,l am about to describe is not limited to anyparticular make or design of typewriting machine.

Referrin to Fi 1, the .numeral 1 indicates the igrame o a typeWritlng-amachine which is provided with a transversely 1nov able carriage. 2, the said carriage being provided With a platen 2a. The carriage 2 travels upon the rods 2b held by the frame 1;

f In this instance the carriage 2 is provided with a rack 3 provided with a sin` le row ot teeth 3a. A spring il, a portion o which 1s only shown, acts to move the carriage 2 1n \the direction of the arrow whenever the esca ement is actuated by the `depression of a key-lever, yas 1s usual.

escapenrenty 5 which comprises the vertically lnovable, slides (3 and 7 having pivotally secured thereto latches 8 and 9 respectively, the said latches being pivotally secured to said slides as at 10 and 11. rl`he slides 6 and 7 are slidably mounted on a support 12 having an opening 12 therein, within which ablock 13 1s inserted-and held Within said `slot by a pin 13, the holding means for said block comprising plates '14 which overlap the slides 6 and 7 thereby also holding the said slides against the'support 12, ;but ermitting the same to'move vertically.` ee 4Fi 3). lin order to impart to the said sli es an alternate up and downmovement, l provide the slides 6 and Zfwith blocks' and 7 respectively, inwhich slots f5 are cut. To operate the slides, ll provide rods 16, which are inserted within the said slots, the said rods being attached to a connecting bar L7 at one end thereof and to a lever 18 at the other end thereof, the lever 18 bein pivoted, by a machine screw 19, to a bloc 20on the support 12, as .shown in Fig. 3.1 The lever 17 at one end thereof has attached thereto an operating rod 21 which' extends downwardly to a 'bar under the key-levers in the usual manner'. The latches 8 and 9 are returned, after each `operation thereof, by springs 22 and 23 respectively, while the lever 18 is4 returned after cach operation by a spring 24. 'lhe support 12 is attached to a bracket 25,`in this instance, which is secured to the bar 26 of the frame, as shown.

Figs. 1 andv 2 illustrate the escapenient in its normal position with the latch 8 in engagement with the teeth of the rack, the tension of the spring 4L keeping the rack against the support 12. When the latch 8 is in engagement with'the teeth of the `rack the point 27 of the latch 9 will just clear the teeth 3 as shown.

When a key-lever is pressed downwardly wardly thereby rotating the lever 18 in a direction which will cause the slide 6 to descend and the slide 7 to rise; this action will be quite obvious by referring to Fig. 2.

As the latch 8 descends the latch 9 will Adjacent the rack 3,fll p1acemy improved the rod 21vvill consequently be pulled down- I move Aupwardly ahead of its adjacent tooth, as shown in Fig. 4.' As'the depth of the teeth of the rack is considerably greaterthan the distance between the points of said teeth and the point 27 of the latch 9, it-is quite obvious that the said point 27 will pass upwardly and aheadof its adjacent rack tooth before the point 28 of thelatch 8 leaves its engaged tooth. Consequently the carriage will not shift until the point 28 of the latch 8 leaves the rack. Fig. 3 illustrates this point.

When the latches have changed positions (as in Fig. 3) the spring 4 will move the carriage until the heel 9b of the latch 9 corr'- tacts the stop 29; the distance between the heel 9b and stop 29 is designed to allow the carriage to move one tooth which brings the latch 9 to the yposition shown in Fig.'5. When the key is released the spring 24 will pull the lever 18 downwardly, thereby drawing the latch 9 away from its engaged tooth, and allowing the latch 8 to engage its adjacent tooth; the latch will again e in the position'shown in Fig. l. During the movement of the carriage to the left, or during its movement for writing, the latch 9 is the only latch which swings. When the carriage is pushed back for a new line the latch 8 will knock down.

From the foregoing description it is quite obvious that' V'the carriage cannot skip, as there is always one latch 1n engagement with the rack.

The above described device is a division of an application for ptent for typewriting machines -led by me arch 29, 1909, vSerial No. 486,421.

Having now described my invention What I claim and desire yto secure by Letters Pat'` ent is 'i 1. In atypewriting machine, a rame, a

- carriage adaptedl for movement on .said

frame, means adapted to move said carriage, a-n escapement adapted to permit` said carriageto move step by step, consisting of a plurality of vertically movable slides,.piv

-otal latches carried by said slides, a rack cairied'by said carriage adapted to engage said latches, one of said latches beingnor-v mally in engagement with said rack, andmeans adapted to cause said latches to alterf nately engage said rack.

2. In a typewritingmachine, a frame, a carriage adapted for movement von said f frame, a rack carried by said carriage, nfeans adapted to move said carriage, an escapement adapted to permit said carriage to of vertically movable slides, pivotal latches carried by said slides adapted to swing in opposite directions, said latches being posi such a. manner as to permit of the engagenient of either of said latches with said iack before the other of .said latches leaves its engaged rack tooth, and means adapted to alternately operate said slides.

carriage adapted for movement on said frame, means adapted to move said carriage, a rack carried by said carriage, an escapeinent adapted to permit said carriage to move step by step, said escapcmeiit-couiprising a support, a plurality oi vertically Vmovable slides cairied by said support, latches pivotally mounted at the upper end otsaid slides and adapted for movement in opposite directions, one of said latches beine; provided ivith a heel adapted to contact ivitli a stop on the latch to which it is attached, the other of said latches being normally engaged with said rack, and means adapted to move said slides in opposite directions.

4. In a typewriting machine, a frame, a

frame, means adapted to movesaid carriage, a rack carriedI by said carriage, an escapement adapted to permit said carriage to move step by step, said esca ement comprisable slides carried by said support, springopposed latches pivotally secured to the FREDERICK ALEXANDER.

Witnesses: Y

WM. F. LAsKoWsKnlJr., )Divano A. JAnvis.

carriage adapted for movement on saidmove step by step, consisting of a plurality tioned relatively to the teeth of said raekin v 3. In a typewritiiig machine, a frame, a

ing a support, a plurality o vertically movupper end of said slidesand adapted for 

